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Input/Output Formats in Java: Currency, Percentages, and Interactivity

Learn how to apply currency and percentage formats to program output in Java, as well as how to create interactivity using keyboard input and dialog boxes.

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Input/Output Formats in Java: Currency, Percentages, and Interactivity

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  1. Chapter 3 Input/Output

  2. Apply formats (currency and percentages) to output. • Use keyboard input in Java program to create interactivity. • Use dialog box input/output in Java program to create interactivity. • Associate import statements with corresponding input/output/format classes/packages. Objectives

  3. Input data from the Java console: Note: In order to use this class, you must use the following import statement: import java.util.Scanner; Scanner Class

  4. Scanner Age Example:

  5. Scanner Addition Example:

  6. An input dialog box asks a question and uses a box for entering a response. String response = JOptionPane.showInputDialog(null, "Enter Fahrenheit"); If this data is to be used in a calculation, it will need to be converted from String data to double data or integer data with one of the following statements: double fahrenheit = Double.parseDouble(response); Note: In order to use this class, you must use the following import statement: import javax.swing.JOptionPane; Input Dialog Boxes

  7. Uses a simple window to display (output) information. JOptionPane.showMessageDialog(null, "Fahrenheit: " + fahrenheit + "\nCelsius: " + celsius); Note: In order to use this class, you must use the following import statement: import javax.swing.JOptionPane; Message Dialog Boxes

  8. JOptionPane Addition Example

  9. JOptionPane Addition Output

  10. Used to format output as currency. Currency Example:  NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance( ); System.out.println(currencyFormatter.format(20.5) ); Output: $20.50 Note: In order to use this NumberFormat class, you must use the import statement: import java.text.NumberFormat; NumberFormat Class

  11. Used to format output with a specific number of digits before and after the decimal point. double fahrenheit = 212.5; DecimalFormat patternFormatter = new DecimalFormat ("#,###.00"); System.out.println(“The temperature is “ + patternFormatter.format(fahrenheit));  Output: The temperature is 212.50 Note: In order to use this NumberFormat class, you must use the following import statement: import java.text.DecimalFormat; DecimalFormat Class

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